1/*
2 * "security" table for IPv6
3 *
4 * This is for use by Mandatory Access Control (MAC) security models,
5 * which need to be able to manage security policy in separate context
6 * to DAC.
7 *
8 * Based on iptable_mangle.c
9 *
10 * Copyright (C) 1999 Paul `Rusty' Russell & Michael J. Neuling
11 * Copyright (C) 2000-2004 Netfilter Core Team <coreteam <at> netfilter.org>
12 * Copyright (C) 2008 Red Hat, Inc., James Morris <jmorris <at> redhat.com>
13 *
14 * This program is free software; you can redistribute it and/or modify
15 * it under the terms of the GNU General Public License version 2 as
16 * published by the Free Software Foundation.
17 */
18#include <linux/module.h>
19#include <linux/netfilter_ipv6/ip6_tables.h>
20#include <linux/slab.h>
21
22MODULE_LICENSE("GPL");
23MODULE_AUTHOR("James Morris <jmorris <at> redhat.com>");
24MODULE_DESCRIPTION("ip6tables security table, for MAC rules");
25
26#define SECURITY_VALID_HOOKS	(1 << NF_INET_LOCAL_IN) | \
27				(1 << NF_INET_FORWARD) | \
28				(1 << NF_INET_LOCAL_OUT)
29
30static const struct xt_table security_table = {
31	.name		= "security",
32	.valid_hooks	= SECURITY_VALID_HOOKS,
33	.me		= THIS_MODULE,
34	.af		= NFPROTO_IPV6,
35	.priority	= NF_IP6_PRI_SECURITY,
36};
37
38static unsigned int
39ip6table_security_hook(unsigned int hook, struct sk_buff *skb,
40		       const struct net_device *in,
41		       const struct net_device *out,
42		       int (*okfn)(struct sk_buff *))
43{
44	const struct net *net = dev_net((in != NULL) ? in : out);
45
46	return ip6t_do_table(skb, hook, in, out, net->ipv6.ip6table_security);
47}
48
49static struct nf_hook_ops *sectbl_ops __read_mostly;
50
51static int __net_init ip6table_security_net_init(struct net *net)
52{
53	struct ip6t_replace *repl;
54
55	repl = ip6t_alloc_initial_table(&security_table);
56	if (repl == NULL)
57		return -ENOMEM;
58	net->ipv6.ip6table_security =
59		ip6t_register_table(net, &security_table, repl);
60	kfree(repl);
61	return PTR_RET(net->ipv6.ip6table_security);
62}
63
64static void __net_exit ip6table_security_net_exit(struct net *net)
65{
66	ip6t_unregister_table(net, net->ipv6.ip6table_security);
67}
68
69static struct pernet_operations ip6table_security_net_ops = {
70	.init = ip6table_security_net_init,
71	.exit = ip6table_security_net_exit,
72};
73
74static int __init ip6table_security_init(void)
75{
76	int ret;
77
78	ret = register_pernet_subsys(&ip6table_security_net_ops);
79	if (ret < 0)
80		return ret;
81
82	sectbl_ops = xt_hook_link(&security_table, ip6table_security_hook);
83	if (IS_ERR(sectbl_ops)) {
84		ret = PTR_ERR(sectbl_ops);
85		goto cleanup_table;
86	}
87
88	return ret;
89
90cleanup_table:
91	unregister_pernet_subsys(&ip6table_security_net_ops);
92	return ret;
93}
94
95static void __exit ip6table_security_fini(void)
96{
97	xt_hook_unlink(&security_table, sectbl_ops);
98	unregister_pernet_subsys(&ip6table_security_net_ops);
99}
100
101module_init(ip6table_security_init);
102module_exit(ip6table_security_fini);
103